Silva Luiz André Juvêncio, da Silva Weberson Pereira, Giuliani Jason G, Canobre Sheila Cristina, Garcia Carlos D, Munoz Rodrigo Alejandro Abarza, Richter Eduardo Mathias
Universidade Federal de Uberlândia, Universidade Federal de Uberlândia, Av. João Naves de Ávila, 2121, Uberlândia, MG, 38408100, Brazil.
Universidade Federal de Uberlândia, Universidade Federal de Uberlândia, Av. João Naves de Ávila, 2121, Uberlândia, MG, 38408100, Brazil; Department of Chemistry, Clemson University, South Carolina, USA.
Talanta. 2017 Apr 1;165:33-38. doi: 10.1016/j.talanta.2016.12.009. Epub 2016 Dec 6.
The possibility of using pyrolyzed paper as disposable working electrodes for trace metals determination is reported for the first time. A small piece of pyrolyzed paper (0.7×0.7cm) was positioned at the bottom side of the electrochemical cell using a rubber O-ring, which defined the electrode area (0.48cm; 0.18cm). A large number of electrodes can be obtained from a single piece of standard dimensions (2.5cm×7.5cm) of paper, therefore minimizing the cost per unit. The electrochemical performance of the pyrolyzed paper was demonstrated by cyclic voltammetry, electrochemical impedance spectroscopy and by the determination of Zn, Cd, and Pb by square-wave anodic stripping voltammetry. The unmodified pyrolyzed paper showed excellent performance for Pb and Cd detection (LOD =0.19 and 0.16 ppb, respectively). In the presence of Bi(in-situ film formation), the simultaneous determination of Zn, Cd and Pb was also possible (LOD=0.26, 0.25, and 0.39 ppb, respectively).
首次报道了使用热解纸作为一次性工作电极测定痕量金属的可能性。用橡胶O形环将一小片热解纸（0.7×0.7厘米）放置在电化学池底部，该O形环确定了电极面积（0.48平方厘米；0.18平方厘米）。从一张标准尺寸（2.5厘米×7.5厘米）的纸张中可以获得大量电极，因此将单位成本降至最低。通过循环伏安法、电化学阻抗谱以及通过方波阳极溶出伏安法测定锌、镉和铅，证明了热解纸的电化学性能。未改性的热解纸在检测铅和镉方面表现出优异性能（检测限分别为0.19和0.16 ppb）。在铋存在的情况下（原位成膜），同时测定锌、镉和铅也是可行的（检测限分别为0.26、0.25和0.39 ppb）。
